1 #pragma once
2 
3 #include <mbgl/style/expression/expression.hpp>
4 #include <mbgl/style/conversion.hpp>
5 #include <mbgl/style/expression/parsing_context.hpp>
6 
7 #include <memory>
8 #include <vector>
9 
10 namespace mbgl {
11 namespace style {
12 namespace expression {
13 
14 class Length : public Expression {
15 public:
16     Length(std::unique_ptr<Expression> input);
17 
18     static ParseResult parse(const mbgl::style::conversion::Convertible& value, ParsingContext& ctx);
19 
20     EvaluationResult evaluate(const EvaluationContext& params) const override;
21     void eachChild(const std::function<void(const Expression&)>& visit) const override;
22     bool operator==(const Expression& e) const override;
23     std::vector<optional<Value>> possibleOutputs() const override;
getOperator() const24     std::string getOperator() const override { return "length"; }
25 
26 private:
27     std::unique_ptr<Expression> input;
28 };
29 
30 } // namespace expression
31 } // namespace style
32 } // namespace mbgl
33